The objective of terrorism is usually promoting fear. Most terrorists want something- whether it be government support or money, like a ransom. Their method for obtaining this and achieving their goal is violence. They commit violent acts as a way to provoke fear throughout a certain place or number of people to put pressure on global leaders and hurt people.
Two more reasons are politics and religion. If you've seen today, many groups fight because of their religion and claim that's what they're told to do. Additionally, it can be because of politics because for one, politicians benefit from war for a variety of reasons in the long run, and the terrorists don't agree with what's going on in the country politically.
He believed the American people would have more money to spend so it would stimulate the economy. He stood for tax cuts to give Americans back their money.
